INFO: task syz-executor:6186 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:6186 tgid:6186 ppid:6185 task_flags:0x400140 flags:0x00000000 Call trace: __switch_to+0x208/0x4ec arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5357 [inline] __schedule+0xd58/0x3180 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xd0/0x344 kernel/sched/core.c:7058 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7115 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x72c/0xffc kernel/locking/mutex.c:760 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:812 del_device_store+0xbc/0x3b8 drivers/net/netdevsim/bus.c:234 bus_attr_store+0x60/0x9c drivers/base/bus.c:172 sysfs_kf_write+0xc4/0x10c fs/sysfs/file.c:145 kernfs_fop_write_iter+0x254/0x3e4 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x4b0/0xb88 fs/read_write.c:686 ksys_write+0xec/0x1d8 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x6c/0x9c fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x50/0x1a0 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 2 locks held by kworker/u8:1/26: 1 lock held by khungtaskd/33: #0: ffff8000873101a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x18/0x1c4 kernel/locking/lockdep.c:6769 1 lock held by klogd/3124: 2 locks held by getty/3258: #0: ffff00001847b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008d5eb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e8/0xdc0 drivers/tty/n_tty.c:2222 2 locks held by sshd-session/3314: 3 locks held by syz-executor/3315: 4 locks held by kworker/1:4/3484: 5 locks held by kworker/u8:0/3574: #0: ffff00000e163148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x6f8/0x18d4 kernel/workqueue.c:3211 #1: ffff8000a1ab7c80 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x71c/0x18d4 kernel/workqueue.c:3211 #2: ffff8000888cd970 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xdc/0x724 net/core/net_namespace.c:658 #3: ffff0000133194e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_destruct+0x10c/0x344 drivers/net/wireguard/device.c:249 #4: ffff800087318a80 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x50/0x5a4 kernel/rcu/tree.c:3815 2 locks held by kworker/u8:3/5300: 7 locks held by syz-executor/6105: #0: ffff00000f24a428 (sb_writers#7){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] #0: ffff00000f24a428 (sb_writers#7){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1798 [inline] #0: ffff00000f24a428 (sb_writers#7){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1934 [inline] #0: ffff00000f24a428 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3107 [inline] #0: ffff00000f24a428 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x670/0xb88 fs/read_write.c:682 #1: ffff000012da0088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1c8/0x3e4 fs/kernfs/file.c:325 #2: ffff0000156964b8 (kn->active#34){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x3e4 fs/kernfs/file.c:326 #3: ffff800088096f88 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xbc/0x3b8 drivers/net/netdevsim/bus.c:234 #4: ffff00001d06f0e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:911 [inline] #4: ffff00001d06f0e8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1096 [inline] #4: ffff00001d06f0e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0x84/0x47c drivers/base/dd.c:1294 #5: ffff00001d069250 (&devlink->lock_key#2){+.+.}-{4:4}, at: devl_lock+0x18/0x24 net/devlink/core.c:276 #6: ffff800087318a80 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x50/0x5a4 kernel/rcu/tree.c:3815 2 locks held by syz-executor/6185: 4 locks held by syz-executor/6186: #0: ffff00000f24a428 (sb_writers#7){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] #0: ffff00000f24a428 (sb_writers#7){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1798 [inline] #0: ffff00000f24a428 (sb_writers#7){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1934 [inline] #0: ffff00000f24a428 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3107 [inline] #0: ffff00000f24a428 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x670/0xb88 fs/read_write.c:682 #1: ffff0000183b2888 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1c8/0x3e4 fs/kernfs/file.c:325 #2: ffff0000156964b8 (kn->active#34){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x3e4 fs/kernfs/file.c:326 #3: ffff800088096f88 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xbc/0x3b8 drivers/net/netdevsim/bus.c:234 =============================================